AQUEOUS COMPOSITIONS CONTAINING PERFLUOROPOLYETHER DI-CARBOXYLIC ACIDS FOR THE OLEO-REPELLANT TREATMENT OF PAPER

摘要

Aqueous dispersions comprising a mixture of:A) from 0.05% by weight to 10% by weight of salts ofperfluoropolyether di-carboxylic derivatives havingformula:T-O-R f-T (IA)wherein- T = -CF2-COOZ or -CF2CF2-COOZ wherein Z = Na, K,NH4, R1 (R2) (R3) N wherein R1= R2= alkyl orhydroxyalkyl, R3= H, alkyl or hydroxyalkyl,- R f is a (per)fluoropolyoxyalkylene chain havingnumber average molecular weight between 500 and10,000.B) from 0.0l% to 55 by weight of water-dispersible or water-soluble cationic polymers, having a charge density,defined as number of equivalents per weight unit of drypolymer, higher than 1 meq/g of dry polymer.